Abstract
Background: Colletotrichum gloeosporioides causes anthracnose in various agricultural crops. Objective: To evaluate the antifungal activity of Ricinus communis and Cyperus rotundus against WSFT and Tainung strains of C. gloeosporioides, comparing them with commercial products containing Bacillus subtilis (Serenade®) and Streptomyces spp. (Blite Free®). Methods: Inhibition percentages were determined through a dose-response bioassay with Serenade® and Blite Free® and the ethanolic extracts of R. communis and C. rotundus on the strains of C. gloeosporioides isolated from Carica papaya. Results and conclusions: R. communis induced higher mycelial inhibition (62.7 %) in the Tainung strain compared to Serenade® (54.2 %) and Blite Free® (0 %). The EC50 values obtained in the WSFT strain were similar between R. communis (0.80 %) and Serenade® (0.79 %). The antifungal activity of the plant extracts proved comparable to that of commercial products, suggesting their potential for controlling C. gloeosporioides.
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